package com.yc.demo.d0316;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.FileInputStream;
import java.io.IOException;

@WebServlet("/upload/*")
public class GetUploadServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        //获取资源地址
        String uri = request.getRequestURI();
        //提取文件名
        String filename = uri.replaceAll(".+/upload/(.+)", "$1");
        //设置返回的内容类型
        //html==>text/html, jpg ==>image/jpeg
        String mimeType = request.getServletContext().getMimeType(filename);
        response.setContentType(mimeType);
        //将文件返回给浏览器
        // io流

        String path =uploadImageServlet.IMAGE_PATH+filename;

        try(FileInputStream fis = new FileInputStream(path)) {
            byte[] buffer = new byte[1024];
            int count;
            ServletOutputStream out = response.getOutputStream();
            while ((count = fis.read(buffer))> -1){
                out.write(buffer,0,count);
            }
        }
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    }
}
